91118223 has 32 divisors (see below), whose sum is σ = 155724800. Its totient is φ = 51578208.

The previous prime is 91118221. The next prime is 91118239. The reversal of 91118223 is 32281119.

It is not a de Polignac number, because 91118223 - 2¹ = 91118221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91118221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18390 + ... + 22812.

It is an arithmetic number, because the mean of its divisors is an integer number (4866400).

Almost surely, 2^91118223 is an apocalyptic number.

91118223 is a deficient number, since it is larger than the sum of its proper divisors (64606577).

91118223 is a wasteful number, since it uses less digits than its factorization.

91118223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548 (or 4542 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 91118223 is about 9545.5865718142. The cubic root of 91118223 is about 449.9888441679.

Adding to 91118223 its sum of digits (27), we get a triangular number (91118250 = T₁₃₄₉₉).

The spelling of 91118223 in words is "ninety-one million, one hundred eighteen thousand, two hundred twenty-three".